The Collaborative International Dictionary of English v.0.48:

Sol-fa \Sol`-fa"\, v. t.
   To sing to solmization syllables.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Sol-fa \Sol"-fa"\, n.
   The gamut, or musical scale. See Tonic sol-fa, under
   Tonic, n.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sol-fa \Sol`-fa"\, v. i. [imp. & p. p. Sol-faed;p. pr. & vb.
   n. Sol-faing.] [It. solfa the gamut, from the syllables fa,
   sol.]
   To sing the notes of the gamut, ascending or descending; as,
   do or ut, re, mi, fa, sol, la, si, do, or the same in reverse
   order.
   [1913 Webster]

         Yet can I neither solfe ne sing.         --Piers
                                                  Plowman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

solfa
    n 1: a system of solmization using the solfa syllables: do, re,
         mi, fa, sol, la, ti [syn: tonic solfa, solfa]